where \({RL,t}{}{D^{\gamma }_{t_{0}+}}K(t,s)\)  is a partial Riemann-Liouville fractional differentiation operator of order \(\gamma > 0\)  [1]} with respect to \(t\)  of a function \(K(t,s)\)  of two variables with lower terminal \(t_{0}\)  and \(J=[t_{0},T]\) , \(\hat{J}=(t_{0},T)\) .

